我如何做一個線程客戶端套接字

Question

我用一個<asp:Button>完成了一個簡單的ASPX頁面。 該頁面將通過套接字與Windows Form應用程序建立連接。

應該如何工作

每次單擊<asp:Button>我都必須將一些信息傳遞給Windows窗體讀取的內容，然后將其打印出來。

TCP服務器代碼

public partial class PaginaTeste : System.Web.UI.Page
{
    private TcpListener tcpListener;
    private Thread listenThread;

    protected void Page_Load(object sender, EventArgs e)
    {
    }

    protected void btnBotao_OnClick(object sender, EventArgs e)
    {
        this.tcpListener = new TcpListener(IPAddress.Any, 8849);
        this.listenThread = new Thread(new ThreadStart(ListenForClients));
        this.listenThread.Start();
    }

    private void ListenForClients()
    {
        this.tcpListener.Start();

        while (true)
        {
            //blocks until a client has connected to the server
            TcpClient client = this.tcpListener.AcceptTcpClient();

            //create a thread to handle communication 
            //with connected client
            Thread clientThread = new Thread(new ParameterizedThreadStart(HandleClientComm));
            clientThread.Start(client);
        }
    }

    private void HandleClientComm(object client)
    {
        TcpClient tcpClient = (TcpClient)client;
        NetworkStream clientStream = tcpClient.GetStream();

        byte[] message = new byte[4096];
        int bytesRead;

        while (true)
        {
            bytesRead = 0;

            try
            {
                string serverResponse = "571764;10.";                        
                Byte[] sendBytes = Encoding.ASCII.GetBytes(serverResponse);
                clientStream.Write(sendBytes, 0, sendBytes.Length);
                clientStream.Flush();
            }
            catch
            {
                //a socket error has occured
                break;
            }

            if (bytesRead == 0)
            {
                //the client has disconnected from the server
                break;
            }
        }

        tcpClient.Close();
    }

客戶端代碼（Windows窗體）

   public partial class Form1 : Form
    {
        TcpClient clientsocket2;
        Thread thread;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {         
        }

        private void button3_click(object sender, EventArgs e)
        {
            this.clientsocket2 = new TcpClient();
           clientsocket2.Connect("server_ip", 8849);       
            this.thread = new Thread(new ThreadStart(this.imprimir));
            this.thread.Start();
        }
protected void imprimir()
        {       
            NetworkStream serverStream = clientsocket2.GetStream();
            byte[] inStream = new byte[10025];
            serverStream.Read(inStream, 0, (int)clientsocket2.ReceiveBufferSize);
            string returndata = System.Text.Encoding.ASCII.GetString(inStream);

            string r = "Printing Test";
            int retorno = -1;

            retorno = IniciaPorta("COM7");            

            if (retorno == 1)
            {
                ConfiguraModeloImpressora(7);
                BematechTX(r);
                AcionaGuilhotina(1);
                FechaPorta();
            }

            clientSocket.Close();
        }

問題

如果我在<asp:Button>單擊一次並初始化，則我的Client Application正常運行。 在第二次單擊<asp:Button> ，傳遞給Client Application的參數返回空。

在客戶應用程序中我讀為空的地方

string returndata = System.Text.Encoding.ASCII.GetString(inStream);

Answer 1

為什么在頁面中按按鈕時創建tcpListener？ 您需要創建TcpClient並將comand發送給您Winform App這段代碼發送comand並從服務器獲取回復

string data = "Some_Comand";
        byte[] b = Encoding.ASCII.GetBytes(data);
        byte[] buffer = new byte[1024];
        var client = new TcpClient();
        var serverEndPoint = new IPEndPoint(IPAddress.Parse("ip"), 8010);
        client.Connect(serverEndPoint);
        var clientStream = client.GetStream();
        clientStream.Write(b, 0, b.Length);
        Socket s = client.Client;
        byte[] receiveData = new byte[200];
        s.Receive(receiveData);
        Debug.WriteLine(Encoding.ASCII.GetString(receiveData));

就這樣